I'm using python with zope. I used _.round and it seems like it is look unstable. For example if i have one number, 1130.975 and rounded it to 2 decimal places, it will be 1130.97 and not 1130.98. But for certain numbers it will rounded correctly if the last digit is 5. I even used fixedpoint.py but still i've got the same problem. This applies only to numbers that have digit 5 after the decimal places that needs to be rounded.